# A (simple) question on probability that has become confusing

• Mar 27th 2013, 06:23 AM
flashylightsmeow
A (simple) question on probability that has become confusing
Hi all. This question is in a chapter that involves permutations and combinations and I'm a little thrown by it. I can't work out the answer to c)

i have the following for:
a) 0.50
b) 0.25
c)????

I think c) is just 0.25 as well...but have a feeling I'm wrong...or could have a/b. wrong as well! please help! there are no answers in the back of the book.

many thanks!
• Mar 27th 2013, 06:45 AM
Plato
Re: A (simple) question on probability that has become confusing
Quote:

Originally Posted by flashylightsmeow
Hi all. This question is in a chapter that involves permutations and combinations and I'm a little thrown by it. I can't work out the answer to c)
i have the following for:
a) 0.50
b) 0.25
c)????
I think c) is just 0.25 as well...but have a feeling I'm wrong...or could have a/b. wrong as well! please help! there are no answers in the back of the book.

Is it true that \$\displaystyle B\subset A~?\$
• Mar 27th 2013, 06:55 AM
flashylightsmeow
Re: A (simple) question on probability that has become confusing
yes
• Mar 27th 2013, 07:00 AM
flashylightsmeow
Re: A (simple) question on probability that has become confusing
so...does that mean the answer is 0.25?
• Mar 27th 2013, 07:11 AM
Plato
Re: A (simple) question on probability that has become confusing
Quote:

Originally Posted by flashylightsmeow
so...does that mean the answer is 0.25?

Well \$\displaystyle A\cap B=B\$. So yes.
However, I do find the wording of the question some what odd.
• Mar 27th 2013, 07:23 AM
flashylightsmeow
Re: A (simple) question on probability that has become confusing
Agh I know, It's from Paul Newbold and William Carlson's Statistics for Business and Economics...load of absolute cr*p! riddles with mistakes. Thank you very much Plato! No doubt there will be more posts like this in the future!